if you have dd-wrt on your router its easier then that.... use the htc wifi sharing app that you have been...
go in to the wireless status page of your router (i.e.
http://192.168.1.1/Status_Wireless.asp)
now click on site survey on the bottom middle left button .... click the wifi thats your phones name. it will say sucessfully joined ... click ok then apply.
GO to the wireless security part and chnage the security to wep and put in your own pw...... hit save and wala now u can connect whatever you want to the 4 ports of the switch and it will use the phones internet....
Feel Free to use the WIFI sharing while u are charging the phone as i have yet to have my TP2 overheat bc of the wireless and chargin @ the same time.